Display screen or a portion thereof with graphical user interface



FIG. 1 is an image of a first embodiment of a display screen or a portion thereof with a graphical user interface;

FIG. 2 is an image of a second embodiment of a display screen or a portion thereof with a graphical user interface;

FIG. 3 is an image of a third embodiment of a display screen or a portion thereof with a graphical user interface; and,

FIG. 4 is an image of a fourth embodiment of a display screen or a portion thereof with a graphical user interface.

The outermost broken lines illustrate a display screen or portion thereof and form no part of the claimed design. The remaining broken lines, illustrating portions of the graphical user interface, form no part of the claimed design. 

CLAIM The ornamental design for a display screen or a portion thereof with a graphical user interface, as shown and described. 